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Question: i am working through my textbook learning about logarithms and...

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b log, 100 e log, (3.68 x 1011) c log, 10 d logs 0.0693 Change log, a to a logarithm to base a. 2 147 EVALUATIONS USING THE L
I am working through my textbook learning about logarithms and have come to evaluations using the laws of logarithms.
My question is in the example how have they known which law to use to evaluate the question and where have the circled values come from for these evaluations.
Thanks :)
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